"First look: Season 7 #HOLLA," announced the caption of the pic, which was posted on The Voice's Instagram page.

Stefani, 44, is following in the footsteps of Christina Aguilera and Shakira as the panel's sole female judge and shared a pic of herself outside the studio on Tuesday, along with the caption "#workingit on the set."

Williams, 41, who collaborated with the No Doubt singer on her 2004 hit "Hollaback Girl," said on the Today show in May that working together again was "magical." "It's serendipitous," he added. "We've always had a special connection."

But will their connection be stronger than Levine and Shelton's bromance?